直接安装：
yum -y install net-tools
2.rpm包安装
rpm -ivh xinetd-2.3.14-34.el6.x86_64.rpm
rpm -ivh telnet-server-0.17-47.el6.x86_64.rpm
rpm -ivh telnet-0.17-47.el6.x86_64.rpm
直接安装：
yum -y install net-tools
2.rpm包安装
rpm -ivh xinetd-2.3.14-34.el6.x86_64.rpm
rpm -ivh telnet-server-0.17-47.el6.x86_64.rpm
rpm -ivh telnet-0.17-47.el6.x86_64.rpm